Water is necessary for carrying nutrients to your cells, flushing bacteria from your system, preventing dehydration, and replacing fluids lost from sweating, but you may not need to drink as much as you thought.
Stephen R. Daniels. pediatrician. No. You shouldn't give your newborn water or sugar water. And if you're feeding powdered or concentrated formula to your baby, never dilute it with more than the amount of water called for on the label. Your infant will get all the necessary hydration from breast milk or formula.
This is why most experts say you can't get a baby this young on a schedule because they are growing so much that they need to eat on demand. So if your baby is being fussy in between feedings I think you should feed him either breast milk or formula. Both my doctor and midwife said not to give water.